# -*- coding: utf-8 -*-
# author yzs
# date 2018-12-08
#
# Description
# Your task is to Calculate a + b.
# Input
# nput contains multiple test cases. Each test case contains a pair of integers a and b, one pair of integers per line. A test case containing 0 0 terminates the input and this test case is not to be processed.
# Output
# For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.
# Sample Input 1 
# 1 5
# 10 20
# 0 0
# Sample Output 1
# 6
# 30

while True:
    a, b = map(int, input().strip().split())
    if a == 0 and b == 0:
        break
    print(a + b)
